The general-purpose registers, base registers, and index registers can all be used as the base in addressing modes, and all of those registers except for the stack pointer can be used as the index in addressing modes.
42.
Because of the simple memory interface that can be programmed by setting a default memory location and writing a few base registers, the chips are quite popular with hobbyists as well as with automotive and industrial developers.
43.
An operand is two bytes long, typically representing an address as a 4-bit nibble denoting a base register and a 12-bit displacement relative to the contents of that register, in the range 000 & ndash; FFF ( shown here as hexadecimal numbers ).
44.
The two 18-bit base registers ( one for instruction storage and one for data storage ) permitted dynamic relocation : as a program got swapped in and out of main memory, its instructions and data could be placed anywhere each time it got reloaded.
45.
RISC-V CPUs jump to calculated addresses using a " jump and link-register, " jalr instruction . jalr is similar to jal, but gets its destination address by adding a 12-bit offset to a base register . ( In contrast, jal adds a larger 20-bit offset to the PC .)
46.
The operating system loads the physical address of this segment into a " base register " and its size into a " bound register " . " Virtual " addresses seen by the program are added to the contents of the base register to generate the " physical address ".
47.
The operating system loads the physical address of this segment into a " base register " and its size into a " bound register " . " Virtual " addresses seen by the program are added to the contents of the base register to generate the " physical address ".
48.
RISC-V also recycles jalr to return from a subroutine : To do this, jalr's base register is set to be the linkage register saved by jal or jalr . jalr's offset is zero and the linkage register is zero, so that there is no offset, and no return address is saved.
49.
In this model, four of the processor's eight general purpose registers take on special roles : R4 is used as a base register for loading and storing global data, R5 is used to point to the current function's area on the call stack, and R6 is used as a stack pointer.
50.
Alternate ways of silicon identification might be present; for example, DSPs from Texas Instruments contain a memory-based register set for each functional unit that starts with identifiers determining the unit type and model, its ASIC design revision and features selected at the design phase, and continues with unit-specific control and data registers.
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